脱式计算能简算的要用简便方法计算。1+2+4+8+16+32+64+128+256+512+102

2.5×0.32×125
＝(2.5×0.4)×(0.8×125)
＝1×100
＝100

907×99+907
=907×(99+1)
=907×100
=90700

(1/3+1/4+1/5)×60
=(1/3)×60+(1/4)×60+(1/5)×60
=20+15+12
=47

[(1/7)-(1/9)]×63-（2/3）
=(1/7)×63-(1/9)×63-(2/3)
=9-7-(2/3)
=1又1/3

(3/5)×[(2/8)×2-(1/3)]
=(3/5)×[(1/2)-(1/3)]
=(3/5)×(1/6)
=1/10

{(4/5)-[(1/5)+(1/3)]}÷(4/5)
={(4/5)-(1/5)-(1/3)}×(5/4)
=(4/15)×(5/4)
=1/3

12.5×4×0.25×8
=(12.5×8)×(4×0.25)
=100×1
=100

(6/7)×125×7×8
=[(6/7)×7]×(125×8)
=6×1000
=6000

24×[(5/8)+(5/6)]-35
= 24×(5/8)+24×(5/6)-35
=15+20-35
=35-35
=0

（分数我用括号括起来了，写的时候记得去掉，5/8读作八分之五，应该看得懂吧！）

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。。。
你 他 妈 在玩儿我吧！